John Wesley on Joshua 1:11

Prepare you victuals - For although Manna was given them to supply their want of ordinary provisions in the wilderness; yet they were allowed, when they had opportunity, to purchase other provisions, and did so, Deut 2:6,28. And now having been some time in the land of the Amorites, and together with Manna used themselves to other food, which that country plentifully supplied them with; they are warned to furnish themselves therewith for their approaching march. Three days - These words, though placed here, seem not to have been delivered by Joshua 'till after the return of the spies; such transpositions being frequent in scripture. And hence it comes, that these three days mentioned here below, after the history of the spies, are again repeated Josh 3:2.